Double-suction centrifugal pump



J. W. PINKERTON AND E. TOMLINSON.

DOUBLE SUCTION CENTRIFUGAL PUMP.

APPLICATlON FILED OCT. 2!, l 9l9.

Patented Sept. 14, 1920;

' INVENTORS James WPmJc ertonand y 15ml" 1 077256125010 JAMES W.VPINKERTO1\T, or LODI, AND E u su STATES 'P ATEN EOJFF SAID TOMLINSON essreivort To sA'In PINKER'ION. ,7

DOUBLE-SUCTION CENTRIFUGAL To all whom it may concern:

ful Improvements in Double-Suction Centrifugal Pumps; and we do declare the following to be a full, clear, and exact descriphave a water cushion tion of the same, reference being had to the accompanying drawings, and to the'char-- acters of reference marked thereon, which form a part of this application.

This invention relates to improvements in centrifugal pumps, the principal object being to provide a pump so constructed that all end thrust will be eliminated, having equal balance at all heads, and which will surrounding the runner at all times. 7 w I I A further object is to produce a pumpl which will have very few parts, and whic will need very little machining in'its manufacture. i

These features we attain by providing a water intake on each side of the runner, and by such other construction as will be hereinafter described.

A further object of the invention is to produce a simple and inexpensive device, and yet one which will be exceedingly effective for the purposes for which it is designed.

These objects we accomplish by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

In the drawings similar characters of reference indicate corresponding parts in the several views.

Figure 1 is a longitudinal plan section of the pump. a

Fig. 2 is a cross section of the same, taken through the runner.

Fig. 3 is a fragmentary elevation showing the double intake at its outer connecting flange. 7

Referring, now more particularly to the characters of reference on the drawings, the numeral 1 denotes a shaft turnably mounted on bushings 2 fixed in the hubs 3 of the pump casing 4, having a supporting base 4*, this casing being split along its vertical center line as at 5 and suitably secured together,

Specification of Letters Eatent.

Application filed October 21. 1919 Serial'No. 332,346.

Patented Sept. 14., 1920.

- in order that the pumprunner may be installed therein.

This ca'sing, as is usual practice, is pro- MER, roirinnvs0N,v or s'rooK'roN, CALIFORNIA;

vided with a peripheral cavity or chamber 6, circular in cross section, and increasing'in diameter from its inception to the discharge 7. v

Secured to the shaft 1, and positioned in the casing isv a runner 8, comprising suitably shaped vanes 9 securedto the hub 10, the vanes beinginclosed'in side walls or webs 11. The vanes and webs however, do

not extend to the shaft 1, butterminate short thereof, leaving an orifice 12 on each side of the hub concentric with the shaft for the entrance of the water into the runner. The hub therefore forms a diverting wall for a' certain distance from the shaft, sloping away from the shaft substantially to a point, as shown in Fig. 1,-so thattwo channels 13 are formed betweenthewebs of the runner, which channels unite to form one at the termination of the hub. The runner is of course so constructed that these chan-" nels shall be of suflicient size relative to the opening 12 that there will be no friction or;

edges of the runner, and being close thereto,

as shown at 15 in Fig. 1. V

The inner ends of the runner webs are closely alined with the casing at an angle of 45 degrees toward the center, as shown at 16 in Fig. 1, this construction having been found to cause the least water friction and a a pressure at that point.

' The casing 1 between the runner and the bushing 2 is provided with a chamber 17 surrounding the shaft 1, equal in diameter to the runner orifice 12. I This chamber comthereto.

Each of these intakes is formed integral with one of the halves of the casing 4.

Beyond one of the bushings 2 is a packing gland 20, through which the shaft 1 projects to enable it to be connected to a source of turning power, while the other end of the shaft terminates in that bushing, theyhub 3 at that end being provided with an air tight cap 21, so that even with no packing gland at that end, air cannot leak therethrough to impede the suction of the pump.

In the operation of thepump it will be evident that the water will be drawn into the runner equally from both sides, on account of the double intake. Also, the two separate columns of water will press with equal force on the interior walls and sides of the hub, centralizing the runner in the casing at all times, and thus giving equal balance at all speeds-and heads of water, and eliminating end thrust. r

This feature of equal balance is aided by the permanent water cushion had between the runner webs and the casing on thesides thereof. v 7

,On account of the fact that the runner v will always be perfectly balanced, we are able to assemblethe parts with but very little machining being necessary, since the runner will never contact with the casing at any) point when once running. p y

y splitting the casing vertically instead ofhorizontally we not only obtain a stronger construction andmorerigid bearing for the shaft, by reason of the vsolid bored hubs possible, but may adjust the side distance between the runner and the casing by placing gaskets of different thicknesses between the split portions of the casing.

From the foregoing description it will be readily seen'that we have produced such a device as substantially fulfils the object of the invention as set forth herein.

While thisspecification sets forth in clehub thereon and a runner secured on the hub, the runner comprising vanes and havng spaced web's connecting the sidevedges of the vanes and spaced from the wallsof the casing, the casing being split transversely of the shaftand centrally of the runner, whereby gaskets may be placed between the adjacent split edges of the-casing to alter the distance between the same and the walls of the runner. 1 1

2. A centrifugal pump comprising a casing, a shaft turnably mounted therein, a runner on the shaft, said runnerincluding vanes, and spaced webs joining the side edges thereof; and a central'chamber sur rounding the shaft extending on both sides of the runner'and adapted to receive a flow of water thereintoatboth ends the sides of the webs being spaced from the casing to form a water cushion therebetween, and the casing and webs adjacent the chamber being at an opposed angle to the shaft relative to the'direction of the flow of water into the central chamber, whereby thewater friction and pressureat those points will be reduced to a minimum.

In testimony whereof we aflix our signatures in presence of two witnesses.

JAMES w. INKER ONQ ELMERTOMLINSQN;

Witnesses? j I d 'BERNARD PRIVAT,. FRANK H. CARTER. 

